How old is too old to breastfeed??

The WHO recommends breastfeeding up to 6 months and additionally while learning to eat solid foods for up to two years and beyond*

The healthcare advice is vague when discussing the general age to stop breastfeeding because it's different for every woman obviously, but honestly what age seems appropriate to you ladies??

Any and all advice or opinions would be awesome! My sister didn't breastfeed (chose not to and used formula) at all with her 3 kids lol so if that's you, that's all good too

Let's hear your opinions!